Applying Open-Path FTIR with Computed Tomography to Evaluate Personal Exposures. Part 1: Simulation Studies

Details

• Personal Author:
  Guffey SE ; Hashmonay RA ; Larson TV ; Wu-CF ; Yost MG
• Description:
  This paper presents the theoretical background and the numerical evaluation results obtained using computed tomography coupled with open-path Fourier transform infrared (CT-FTIR) measurements to estimate personal exposures. In this simulation study, we first tested the one-dimensional scenario with a five-beam segment geometry. A series of Gaussian plumes and the corresponding path-integrated concentrations (PICs) were simulated. The personal exposures were estimated as the average of the point estimates calculated from the workers' locations and the concentration profiles reconstructed from the Smooth Basis Function Minimization algorithm. It was found that the running-average PIC updating strategy has similar performance as the spline PIC updating strategy. However, the latter strategy gives delayed estimates of the workers' exposures since it requires additional measurements before and after the time period of interest. In the two-dimensional scenario, we simulated a series of single-mode bivariate Gaussian plumes with a nine-beam radial geometry. The average of the estimated exposures from the CT-FTIR approach was close to the average of the true exposures. The concordance correlation factors between the true and estimated exposures were reasonably good (between 0.50 and 0.58). This study demonstrated that the CT-FTIR approach is feasible for industrial hygiene monitoring. [Description provided by NIOSH]
• Subjects:
  Environmental Monitoring Occupational Exposure Occupational Health Safety Software
• Keywords:
  Author Keywords: Computed Tomography Computer-models Exposure-assessment Exposure-levels Humans Mathematical-models Models Occupational-exposure Open-path FTIR Optical Remote Sensing Personal Exposure Radial Plume Mapping Simulation-methods Workers

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• ISSN:
  0003-4878
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 10 ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  61-71
• Volume:
  49
• Issue:
  1
• NIOSHTIC Number:
  nn:20029069
• Citation:
  Ann Occup Hyg 2005 Jan; 49(1):61-71
• Contact Point Address:
  Chang-Fu Wu, Department of Environmental and Occupational Health Sciences, Box 357234, University of Washington, Seattle, WA 98195, USA
• Email:
  cfwu@u.washington.edu
• Federal Fiscal Year:
  2005
• Peer Reviewed:
  True
• Source Full Name:
  Annals of Occupational Hygiene
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:01662b477aee60b76d2ffbbf0fa0c71afc1e90dc802b6fa176f1457e121e93f79573a62be0465c90992b5bf031825dd838234f86fd166b6f79bf9a1f0a440992
• Download URL:
  https://stacks.cdc.gov/view/cdc/190136/cdc_190136_DS1.pdf
• File Type:
  [PDF - 361.50 KB ]